Fractal vein distributions within a fault-fracture mesh in an exhumed accretionary mélange, Chrystalls Beach Complex, New Zealand

► Analysis of thickness, spacing, and clustering of veins in a fault-fracture mesh. ► Power-law thickness distribution for both shear and extension fractures. ► High fractal dimension of thickness distribution indicates distributed deformation. ► New fractures form in wall rock in preference to reactivation of old veins.